How to adjust the spring tension on Mini-Roller^® HD.

The torsion springs apply downward force to the upper roller assembly. Adjusting them changes the pressure between the rollers, which directly affects fluid application.

• Increase spring rate (more pressure):
  Ensures rollers stay in firm contact with the stock → more consistent coating.
  Useful if fluid coverage is uneven or rollers aren’t contacting properly.

• Decrease spring rate (less pressure):
  Reduces roller force → prevents excess fluid or damage to thin stock.
  Useful if rollers are binding, stock is delicate, or fluid is pooling

   

• Locate the torsion springs
  Each spring coil is held by a shoulder bolt. One leg rests on the sheet metal frame, the other between the adjustment bolt and end plate.
  1. To increase roller pressure
     • Move the shoulder bolt and torsion spring up to the next threaded hole.
     • Reseat the spring leg behind the bolt head.
     • Do this on both sides to keep pressure uniform.
  2. To decrease roller pressure
     • Move the shoulder bolt and torsion spring down to the next threaded hole.
     • Again, adjust both sides equally.
  3. Verify uniformity
  • Springs must be adjusted the same on both sides.
  • Unequal adjustment = uneven fluid application across the stock